Solid insulation busbar connection device and assembly method for solid insulation busbar connection device

Abstract

A solid insulation busbar connection device (50) comprises: a pair of tank connection units (51, 52) attached to each of two electric devices to be connected; and a solid insulation busbar unit (30) installed between the tank connection units (51, 52). The solid insulation busbar unit (30) comprises: a vertical busbar unit (55, 57) having a first central conductor covered with an insulating resin and disposed so as to extend in the vertical direction; and a horizontal busbar unit (56) having a second central conductor covered with an insulating resin and disposed so as to extend in the horizontal direction.

Description

Solid insulated busbar connection device and method for assembling a solid insulated busbar connection device

[0001] FIELD OF THE DISCLOSURE The present disclosure relates to a solid insulated busbar connection device for interconnecting electrical devices and a method for assembling a solid insulated busbar connection device.

[0002] Conventionally, when interconnecting electrical equipment such as gas-insulated equipment, a connection device that insulates the conductors by housing them in a tank filled with an insulating gas such as sulfur hexafluoride is installed between the electrical equipment to be connected.

[0003] In recent years, from the perspective of environmental protection, there has been a demand to reduce the amount of insulating gases used, such as sulfur hexafluoride, which have a high environmental impact. For this reason, there is also a demand for connection devices to be designed so that they do not use insulating gases that have a high environmental impact.

[0004] Patent Document 1 discloses a connection device in which a straight rod-shaped conductor is covered with a fixed covering. The connection device disclosed in Patent Document 1 insulates the straight rod-shaped conductor by covering it with a solid covering, thereby insulating the conductor without using insulating gases that have a high environmental impact.

[0005] JP 2009-44958 A

[0006] The connection device disclosed in Patent Document 1 uses a single straight rod-shaped conductor to connect the two electrical devices to be connected, so the two electrical devices must be installed at the same height. However, depending on the installation environment of the electrical devices to be connected, it may not be possible to install the two electrical devices at the same height, resulting in a difference in height between the two electrical devices. In such cases, the connection device disclosed in Patent Document 1 cannot connect the two electrical devices to be connected.

[0007] The present disclosure has been made in consideration of the above, and aims to provide a solid insulated busbar connection device that can connect electrical devices to each other even if the electrical devices to be connected are installed at different heights.

[0008] To solve the above-mentioned problems and achieve the object, a solid insulated bus connection device according to the present disclosure includes a pair of tank connection sections attached to each of two electrical devices to be connected, and a solid insulated bus section installed between the tank connection sections. The solid insulated bus section includes a vertical bus section having a first center conductor covered with an insulating resin and installed so that the first center conductor extends vertically, and a horizontal bus section having a second center conductor covered with an insulating resin and installed so that the second center conductor extends horizontally.

[0009] According to the present disclosure, it is possible to obtain an effect of providing a solid insulated busbar connection device that can connect electrical devices to each other even when the electrical devices to be connected are installed at different heights.

[0010] sectional view showing the configuration of a solid insulated bus connection device according to embodiment 1; sectional view showing the configuration of a vertical bus section of a solid insulated bus connection device according to embodiment 1; sectional view showing the configuration of a horizontal bus section of a solid insulated bus connection device according to embodiment 1; sectional view showing the configuration of a conductor connection section of a solid insulated bus connection device according to embodiment 1; lateral cross section of a conductor connection section of a solid insulated bus connection device according to embodiment 1; sectional view showing the configuration of a tank connection section of a solid insulated bus connection device according to embodiment 1; sectional view showing the configuration of a pressing section of a solid insulated bus connection device according to embodiment 2; sectional view showing the configuration of a solid insulated bus connection device according to embodiment 3;

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A solid insulated bus connection device and a method for assembling the solid insulated bus connection device according to an embodiment will be described in detail below with reference to the drawings.

[0012] Embodiment 1. Figure 1 is a cross-sectional view showing the configuration of a solid insulated bus connection device according to embodiment 1. A solid insulated bus connection device 50 is installed between a tank 1a of a first electric device and a tank 1b of a second electric device to electrically connect the two. The solid insulated bus connection device 50 has a tank connection portion 51 attached to the tank 1a of the first electric device, a tank connection portion 52 attached to the tank 1b of the second electric device, a pressing portion 53 that presses the tank connection portion 51 against the tank 1a, a pressing portion 54 that presses the tank connection portion 52 against the tank 1b, and a solid insulated bus portion 30 installed between the tank connection portion 51 and the tank connection portion 52. The solid insulated bus section 30 includes vertical bus sections 55, 57, a horizontal bus section 56, a conductor connection section 58 connecting the vertical bus section 55 and the horizontal bus section 56, and a conductor connection section 59 connecting the horizontal bus section 56 and the vertical bus section 57. The vertical bus sections 55, 57 are installed to extend upward from the tank connection sections 51, 52, and the horizontal bus section 56 is installed above the tank connection sections 51, 52.

[0013] The tanks 1a, 1b each include a cylindrical main body 19a, 19b, a tank lid plate flange 11a, 11b installed at one end of the main body 19a, 19b, a cup-shaped insulator 13a, 13b, a connecting conductor 14a, 14b, and an insulator fixing flange 16a, 16b. The insulator fixing flanges 16a, 16b are fixed to one end of the main body 19a, 19b. The insulator fixing flanges 16a, 16b are provided with the cup-shaped insulators 13a, 13b and electric field reduction ring shields 17a, 17b. O-rings 181a, 181b are installed between the tanks 1a, 1b and the tank lid plate flange 11a, 11b. O-rings 182a, 182b are installed between the tank lid plate flange 11a, 11b and the insulator fixing flange 16a, 16b. O-rings 183a, 183b are installed between the insulator fixing flanges 16a, 16b and the cup-shaped insulators 13a, 13b. Therefore, the gaps between the tanks 1a, 1b and the tank lid plate flanges 11a, 11b, the gaps between the tank lid plate flanges 11a, 11b and the insulator fixing flanges 16a, 16b, and the gaps between the insulator fixing flanges 16a, 16b and the cup-shaped insulators 13a, 13b are all kept airtight. Insulating grease 15 is applied to the cup-shaped insulators 13a, 13b. The cup-shaped insulators 13a, 13b form recesses 12a, 12b into which the tank connectors 51, 52 are inserted. Connection conductors 14a, 14b are installed in the recesses 12a, 12b at the bottoms of the cup-shaped insulators 13a, 13b. The connecting conductors 14a and 14b have holes 141a and 141b formed therein.

[0014] FIG. 2 is a cross-sectional view showing the configuration of the vertical bus section of the solid insulated bus connection device according to the first embodiment. Each of the vertical bus sections 55 and 57 includes a first center conductor 61 having a straight rod shape, an insulating resin section 62 made of insulating resin that covers the first center conductor 61, and an outer jacket section 63 that covers the portion of the insulating resin section 62 that is exposed to the outside air. The outer jacket section 63 is made of a conductive material and is connected to ground. An end section 611 of the first center conductor 61 protrudes from the insulating resin section 62. The end section 611 of the first center conductor 61 is a rounded rectangular prism. The rounded rectangular prism has a through hole 613 that extends perpendicular to the axial direction of the first center conductor 61 and penetrates the first center conductor 61. The vertical bus sections 55 and 57 are installed so that the first center conductor 61 extends vertically.

[0015] 3 is a cross-sectional view showing the configuration of the horizontal bus section of the solid insulated bus connection device according to the first embodiment. The horizontal bus section 56 includes a second center conductor 71 having a straight rod shape, an insulating resin portion 72 made of insulating resin that covers the second center conductor 71, and an outer jacket portion 73 that covers the portion of the insulating resin portion 72 that is exposed to the outside air. The outer jacket portion 73 is made of a conductive material and is connected to ground. An end portion 711 of the second center conductor 71 protrudes from the insulating resin portion 72. A female thread 713 is formed on the end face of the second center conductor 71. The horizontal bus section 56 is installed so that the second center conductor 71 extends horizontally.

[0016] 4 is a cross-sectional view showing the configuration of a conductor connection portion of a solid insulated bus connection device according to embodiment 1. Conductor connection portions 58, 59 include a conductive resin portion 91 connecting first center conductor 61 and second center conductor 71, an insulating resin portion 92 covering conductive resin portion 91, an outer jacket portion 93 covering insulating resin portion 92, a metal fitting 94 and a screw 95 for fixing first center conductor 61, an insulating cap 96 covering metal fitting 94 and screw 95, and a conductive cover 97 covering insulating cap 96.

[0017] The conductive resin part 91 has a T-shape where three cylinders intersect, and includes a first cylinder part 911 into which the second central conductor 71 is inserted, a second cylinder part 912 into which the first central conductor 61 is inserted, and a third cylinder part 913 into which the fixing metal fitting 94 is disposed. The first cylinder part 911 and the third cylinder part 913 are arranged coaxially, and the second cylinder part 912 is arranged perpendicular to the first cylinder part 911 and the third cylinder part 913.

[0018] 5 is a horizontal cross-sectional view of the conductor connection portion of the solid insulated bus connection device according to the first embodiment. When the second center conductor 71 is inserted into the first cylindrical portion 911 and the first center conductor 61 is inserted into the second cylindrical portion 912, the side surface of the rounded rectangular prism of the end portion 611 of the first center conductor 61 comes into surface contact with the end face of the second center conductor 71. With the second center conductor 71 inserted into the first cylindrical portion 911 and the end portion 611 of the first center conductor 61 inserted into the second cylindrical portion 912, a screw 95 is passed through the through hole 613 of the first center conductor 61 and the through hole 941 of the fastener 94 and screwed into the female thread 713, thereby fixing the first center conductor 61 and the second center conductor 71 in surface contact. An insulating cap 96 is attached to the third cylindrical portion 913, and a conductive cover 97 is further installed, thereby insulating the fastener 94 and the screw 95 from the outside air.

[0019] The insulating resin part 92 is formed with a recess 921 into which the second central conductor 71 is inserted and a recess 922 into which the first central conductor 61 is inserted. The recess 921 is connected to the first cylindrical part 911 of the conductive resin part 91, and the recess 922 is connected to the second cylindrical part 912 of the conductive resin part 91.

[0020] The end face of the second central conductor 71 is in contact with the side surface of the rounded rectangular prism at the end 611 of the first central conductor 61. That is, the second central conductor 71 and the first central conductor 61 are in surface contact. The first central conductor 61 and the second central conductor 71 are also electrically connected through the conductive resin part 91. Therefore, the first central conductor 61 and the second central conductor 71 are at the same potential, and no discharge occurs between them.

[0021] 6 is a cross-sectional view showing the configuration of a tank connection portion of the solid insulated bus connection device according to the first embodiment. Each of the tank connection portions 51 and 52 includes a third center conductor 81, a conductive resin portion 82 connecting the third center conductor 81 and the first center conductor 61, an insulating resin portion 83 made of insulating resin that covers the third center conductor 81, an outer jacket portion 84 that covers the portion of the insulating resin portion 83 that is exposed to the outside air, a metal fitting 85 and a screw 86 that secure the first center conductor 61, an insulating cap 87 that covers the metal fitting 85 and the screw 86, and a conductive cover 88 that covers the insulating cap 87. One end 811 of the third center conductor 81 protrudes from the insulating resin portion 83. One end 8111 of the third center conductor 81 is inserted into the holes 141a and 141b of the connecting conductors 14a and 14b.

[0022] The conductive resin part 82 has a T-shape where three cylinders intersect, and includes a first cylinder part 821 in which the other end 812 of the third central conductor 81 is disposed, a second cylinder part 822 in which the first central conductor 61 is inserted, and a third cylinder part 823 in which the fixing metal fitting 85 is disposed. The first cylinder part 821 and the third cylinder part 823 are disposed coaxially, and the second cylinder part 822 is disposed perpendicular to the first cylinder part 821 and the third cylinder part 823.

[0023] When the first center conductor 61 is inserted into the second cylindrical portion 822, the side surface of the rounded rectangular prism at the end 611 of the first center conductor 61 comes into surface contact with the end face of the third center conductor 81. With the end 611 of the first center conductor 61 inserted into the second cylindrical portion 822, a screw 86 is passed through the through hole 613 of the first center conductor 61 and the through hole 851 of the fixing bracket 85, and the screw 86 is screwed into the female thread 813, thereby fixing the first center conductor 61 and the third center conductor 81 in surface contact. An insulating cap 87 is attached to the third cylindrical portion 823, and a conductive cover 88 is further installed, thereby insulating the fixing bracket 85 and the screw 86 from the outside air.

[0024] The insulating resin part 83 has a convex part 831 whose convex shape corresponds to the concave shape of the cup-shaped insulators 13 a, 13 b. The insulating resin part 83 also has a concave part 832 into which the first central conductor 61 is inserted. The concave part 832 is connected to the second cylindrical part 822 of the conductive resin part 82.

[0025] The end face of the third central conductor 81 is in contact with the side surface of the rounded rectangular prism at the end 611 of the first central conductor 61. That is, the first central conductor 61 and the third central conductor 81 are in surface contact. The first central conductor 61 and the third central conductor 81 are also electrically connected through the conductive resin part 82. Therefore, the first central conductor 61 and the third central conductor 81 are at the same potential, and no discharge occurs between them.

[0026] FIG. 7 is a cross-sectional view showing the configuration of the pressing portion of the solid insulated busbar connection device according to the first embodiment. In FIG. 7, the tank connection portions 51, 52 are partially omitted from the illustration. The pressing portions 53, 54 include a support rod portion 21 fixed to the tank lid plate flanges 11a, 11b of the tanks 1a, 1b and a pressing plate portion 22 installed on the support rod portion 21. A male thread is formed on an end portion 212 of the support rod portion 21 opposite to an end portion 211 fixed to the tank lid plate flanges 11a, 11b of the tanks 1a, 1b. A hole 221 is formed in the pressing plate portion 22, into which the support rod portion 21 can be inserted. The end portion 212 of the support rod portion 21 is inserted through the hole 221, and a nut 214 is fastened to the end portion 212, thereby pressing the tank connection portions 51, 52 against the tanks 1a, 1b. When the tank connection portions 51, 52 are pressed against the tanks 1a, 1b, the convex portions 831 of the insulating resin portions 83 of the tank connection portions 51, 52 are pressed against the cup-shaped insulators 13a, 13b via the insulating grease 15, thereby firmly fixing the tank connection portions 51, 52.

[0027] When installing the solid insulated bus connection device 50, first, the vertical bus sections 55, 57 and the horizontal bus section 56 are connected in advance using the conductor connection sections 58, 59 to form the solid insulated bus section 30. Next, the tank connection sections 51, 52 are inserted into the tanks 1a, 1b. The solid insulated bus section 30 is then brought close to the tank connection sections 51, 52 from above, and the first center conductor 61 is inserted into the second cylindrical section 822. With the end section 611 of the first center conductor 61 inserted into the second cylindrical section 822, a screw 86 is passed through the through hole 613 of the first center conductor 61 and the through hole 851 of the fixing bracket 85, and the screw 86 is screwed into the female thread 813. An insulating cap 87 is then attached to the third cylindrical section 823, and a conductive cover 88 is then installed. By installing the solid insulated bus connection device 50 using this procedure, it is no longer necessary to support the solid insulated bus section 30 from below when connecting the solid insulated bus section 30 to the tank connection sections 51 and 52, which makes it easier to install the solid insulated bus connection device 50.

[0028] Note that the vertical bus sections 55, 57 of the solid insulated bus section 30 may be attached to the tank connection sections 51, 52 in advance, and the horizontal bus section 56 and the conductor connection sections 58, 59 may then be assembled from above to the vertical bus sections 55, 57. That is, by assembling from above the portion of the solid insulated bus section 30 including at least the horizontal bus section 56 and the conductor connection sections 58, 59 to the vertical bus sections 55, 57 or the tank connection sections 51, 52, which are the portions of the solid insulated bus section 30 other than the horizontal bus section 56 and the conductor connection sections 58, 59, there is no need to support the solid insulated bus section 30 from below when installing the solid insulated bus section 30, which makes it easier to install the solid insulated bus connection device 50.

[0029] In the solid insulated bus connection device of embodiment 1, the solid insulated bus section 30 is arranged between the tank connection section 51 connected to the tank 1a and the tank connection section 52 connected to the tank 1b. Therefore, by making the length of the first central conductor 61 of the vertical bus section 55 and the length of the first central conductor 61 of the vertical bus section 57 different, electrical devices installed at different heights can be connected to each other.

[0030] 8 is a cross-sectional view showing the configuration of a solid insulated bus connection device according to embodiment 2. In the solid insulated bus connection device according to embodiment 2, vertical bus sections 55 and 57 are installed so as to extend downward from tank connection sections 51 and 52, and horizontal bus section 56 is installed below tank connection sections 51 and 52. Other than this, the solid insulated bus connection device is the same as solid insulated bus connection device 50 according to embodiment 1, and therefore a duplicated description will be omitted.

[0031] In solid insulated bus connection device 50 according to the second embodiment, horizontal bus section 56 is installed lower than tank connection sections 51 and 52, and therefore the center of gravity can be lowered compared to solid insulated bus connection device 50 according to the first embodiment. Therefore, solid insulated bus connection device 50 according to the second embodiment can have improved earthquake resistance compared to solid insulated bus connection device 50 according to the first embodiment.

[0032] 9 is a cross-sectional view showing the configuration of a solid insulated bus connection device according to embodiment 3. Solid insulated bus connection device 50 according to embodiment 3 differs from solid insulated bus connection device 50 according to embodiment 1 in that conductor connection portions 58, 59 include multi-contacts 40, and first center conductor 61 and second center conductor 71 are connected via multi-contacts 40.

[0033] Figure 10 is a top view of a multi-contact of a solid insulated busbar connection device according to the third embodiment. Figures 11 and 12 are cross-sectional views of the multi-contact of a solid insulated busbar connection device according to the third embodiment. The multi-contact 40 includes a cylindrical contact case 41 that covers an end 611 of a first center conductor 61, and a coil spring contact 42 that is installed in a groove formed in the inner surface of the contact case 41 and electrically connects the contact case 41 and the first center conductor 61. Chamfered surfaces 413 and 414 are formed on the outer periphery of an end 412 of the contact case 41 opposite the end 411 into which the first center conductor 61 is inserted. The end face of the second center conductor 71 is in surface contact with the chamfered surface 413. Through holes 415 and 416 are formed in the chamfered surfaces 413 and 414, and a bolt 44 is threaded into a female thread 713 through a spring washer 43 and the through holes 415 and 416 to fix the second center conductor 71 to the contact case 41. Note that Figure 11 shows the state in which the first central conductor 61 is inserted into the contact case 41 until it hits the bolt 44, and Figure 12 shows the state in which the first central conductor 61 is inserted into the contact case 41 so that it contacts only the coil spring contactor 42 installed closest to the end 411 of the contact case 41 on the side into which the first central conductor 61 is inserted.

[0034] The insertion length of the first center conductor 61 into the contact case 41 can be freely changed between an insertion length L1 when the first center conductor 61 abuts against the bolt 44 as shown in Fig. 11 and an insertion length L2 when the first center conductor 61 contacts only the coil spring contactor 42 installed closest to the end 411 of the contact case 41 where the first center conductor 61 is inserted as shown in Fig. 12. This makes it easy to change the installation height of the tank connecting portions 51, 52 relative to the height of the horizontal bus bar 56. Therefore, the tanks 1a, 1b can be connected by adjusting the installation height of the tank connecting portions 51, 52 relative to the height of the horizontal bus bar 56, as long as it is within the range adjustable by the multi-contact 40.

[0035] The configurations shown in the above embodiments are merely examples of the content, and may be combined with other known technologies, or parts of the configurations may be omitted or modified without departing from the spirit of the invention.

[0036] REFERENCE SIGNS 1a, 1b Tank, 11a, 11b Tank lid plate flange, 12a, 12b, 832, 921, 922 Recess, 13a, 13b Cup-shaped insulator, 14a, 14b Connecting conductor, 15 Insulating grease, 16a, 16b Insulator fixing flange, 17a, 17b Electric field relaxation ring shield, 19a, 19b Main body, 21 Support rod, 22 Pressing plate, 30 Solid insulated busbar, 40 Multi-contact, 41 Contact case, 42 Coil spring contact, 43 Spring washer, 44 Bolt, 50 Solid insulated busbar connecting device, 51, 52 Tank connecting portion, 53, 54 Pressing portion, 55, 57 Vertical busbar, 56 Horizontal busbar, 58, 59 Conductor connecting portion, 61 First center conductor, 62, 72, 83, 92 Insulating resin portion, 63, 73, 84, 93 Jacket portion, 71 Second center conductor, 81 Third center conductor, 82, 91 Conductive resin portion, 85, 94 Fixing metal fitting, 86, 95 Screw, 87, 96 Insulating cap, 88, 97 Conductive cover, 141a, 141b, 221 Hole, 181a, 181b, 182a, 182b, 183a, 183b O-ring, 211, 212, 411, 412, 611, 711 End, 214 Nut, 413, 414 Chamfered surface, 415, 416, 613, 851, 941 Through hole, 713, 813 Female thread, 811 One end, 812 Other end, 821, 911 First cylindrical portion, 822, 912 Second cylindrical portion, 823, 913 Third cylindrical portion, 831 Convex shaped portion.

Claims

1. A solid-insulated bus connection device comprising: a pair of tank connection parts attached to each of two pieces of electrical equipment to be connected; and a solid-insulated bus part installed between the tank connection parts, wherein the solid-insulated bus part comprises a vertical bus part having a first central conductor covered with insulating resin and installed so that the first central conductor extends in a vertical direction; and a horizontal bus part having a second central conductor covered with insulating resin and installed so that the second central conductor extends in a horizontal direction.

2. The solid-insulated busbar connection device as described in claim 1, characterized in that the first central conductor and the second central conductor are in the shape of a straight rod, the end of the first central conductor is formed into a rectangular prism with rounded corners, and the end face of the second central conductor abuts against the side of the end of the first central conductor to make surface contact.

3. The solid-insulated bus connection device according to claim 1, characterized in that the solid-insulated bus section has a conductor connection section that connects the first central conductor and the second central conductor, and the conductor connection section is made of a conductive material.

4. The solid-insulated busbar connection device described in claim 3, characterized in that the conductor connection portion comprises a multi-contact having a cylindrical contact case into which the first central conductor is inserted and a coil spring contactor mounted on the inner surface of the contact case to electrically connect the first central conductor and the contact case, wherein a flat portion is formed on the outer periphery of the end of the contact case, and an end face of the second central conductor abuts against the flat portion to make surface contact.

5. A solid-insulated busbar connection device according to claim 3, characterized in that the conductor connection portion has a fixing metal fitting for fixing the first central conductor and the second central conductor.

6. The solid insulated busbar connection device according to claim 5, wherein the conductor connection portion has an insulating cap covering the fixing metal fitting.

7. The solid insulated busbar connecting device according to claim 1, further comprising a pressing portion for pressing said tank connecting portion against the tank of said electrical equipment.

8. A solid insulated busbar connection device according to any one of claims 1 to 7, characterized in that the horizontal busbar section is installed above the tank connection section.

9. A solid insulated busbar connection device according to any one of claims 1 to 7, characterized in that the horizontal busbar section is installed below the tank connection section.

10. A method for assembling a solid-insulated bus connection device comprising a pair of tank connection portions attached to each of two electrical devices to be connected, and a solid-insulated bus portion installed between the tank connection portions, wherein the solid-insulated bus portions comprise a vertical bus portion having a first central conductor covered with insulating resin and installed so that the first central conductor extends in a vertical direction, and a horizontal bus portion having a second central conductor covered with insulating resin and installed so that the second central conductor extends in a horizontal direction, the method comprising the step of assembling from above a portion of the solid-insulated bus portion including at least the horizontal bus portion and the conductor connection portion to a portion of the solid-insulated bus portion other than the horizontal bus portion and the conductor connection portion or to the tank connection portion.

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